7 replies to this topic

[andyt]

Are there any differences between crownwheels in A series diffs to A+ ones as i'm thinking of fitting a 62 tooth crownwheel to my 91 A+ differencial.

[Dusky]

Yes, teeth angle is different. But you can use the a series if you swap the pinion too.

[nicklouse]

Mmm there is no such thing as an A series gearbox or even a A+ gearbox.

Just about any of the gearbox types can be used with any of the engines.

But yes there are differences in the gear sets. And you should use matched set of crown and pinion gears.

[GraemeC]

I don't know if you are technically right there Nick or not; but many people, especially parts suppliers, do refer to gearboxes as A and A+ to describe their components.  To me it is perfectly acceptable to recognise there are differences in crownwheels, pinions and others gears by calling them A ort A+ rather than having an encyclopaedic knowledge of part numbers - at least it stops tears when people try to mix them up because 'any gearbox type can be used with any engine'.  I'm not sure what the commonly accepted change point is, I would hazard a guess at when the part numbers started being DAM****

 

 

To the OP - you need to be aware of two things - one is that there are three different 62 tooth crownwheels DAM2677, 22A411 and 22G101 and they have different tooth profiles.  The other is that each one can only be used with a specific corresponding pinion gear with a matching tooth profile (DAM2679, 22A413 and 22G99 respectively) - you CANNOT simply change the crownwheel to get a different differential drive ratio.

[nicklouse]

ahhh just done some looking up and it seems that I am not correct. The gear set in the rod type box did change with the engine change.

[Spider]

Mmm there is no such thing as an A series gearbox or even a A+ gearbox.

Just about any of the gearbox types can be used with any of the engines.

But yes there are differences in the gear sets. And you should use matched set of crown and pinion gears.

 

 

I don't know if you are technically right there Nick or not; but many people, especially parts suppliers, do refer to gearboxes as A and A+ to describe their components.  To me it is perfectly acceptable to recognise there are differences in crownwheels, pinions and others gears by calling them A ort A+ rather than having an encyclopaedic knowledge of part numbers - at least it stops tears when people try to mix them up because 'any gearbox type can be used with any engine'.  I'm not sure what the commonly accepted change point is, I would hazard a guess at when the part numbers started being DAM****

 

 

Technically Nick is correct, however 99.99999999999% of the Mini world refer to the later boxes, as you've pointed out here Graham, that start with DAM**** P/Ns as A+.

 

These later box types, in 'primitive' form, with up-rated bearings and shafts started coming in to being from around late 77 early 78 from memory and pre-date the actual A+ engine by a few years.

 

<Edit: in fact just on the 'A+' title for the engines, I have a number of factory documents that only refer to these as having a different distributor mount (I can't recall their exact wording) as the factory / spare parts means of differentiating between them. I think the A+ title was only used in public press releases to make the ancient engine sound like after nearly 30 years of being in production, it was being up-dated in to something revolutionary, yeah, sure it was,,,,,,,,>

 

<2nd Edit: I've just found another reference yet again to a 'ribbed cylinder block'>

Edited by Moke Spider, 28 November 2015 - 08:33 PM.

[A-Cell]

These later box types, in 'primitive' form, with up-rated bearings and shafts started coming in to being from around late 77 early 78 from memory and pre-date the actual A+ engine by a few years.

These were updated as a result of experience in Allegro. It being a heavier vehicle. Also in readiness for use in Metro.
 
<Edit: in fact just on the 'A+' title for the engines, I have a number of factory documents that only refer to these as having a different distributor mount (I can't recall their exact wording) as the factory / spare parts means of differentiating between them. I think the A+ title was only used in public press releases to make the ancient engine sound like after nearly 30 years of being in production, it was being up-dated in to something revolutionary, yeah, sure it was,,,,,,,,>[/quote]

..it was for the Metro, "A British car to beat the world"

Edited by A-Cell, 28 November 2015 - 07:27 PM.

[Spider]

Yes, it was beaten in a little more than 10 years wasn't it?